Use startswith for env variable testing
Use startswith for env variable testing


Former-commit-id: 810492462e09b59f0649c67f583c32b465cec773
insequent/libcalico,Symmetric/libcalico,tomdee/libnetwork-plugin,TrimBiggs/libnetwork-plugin,tomdee/libcalico,plwhite/libcalico,alexhersh/libcalico,TrimBiggs/libnetwork-plugin,projectcalico/libnetwork-plugin,projectcalico/libcalico,TrimBiggs/libcalico,robbrockbank/libcalico,djosborne/libcalico,L-MA/libcalico,caseydavenport/libcalico